From aeddad1760aeb206d912b27b230269407efd5b06 Mon Sep 17 00:00:00 2001 From: Frederic Barrat Date: Tue, 23 Jan 2018 12:31:42 +0100 Subject: ocxl: Add AFU interrupt support Add user APIs through ioctl to allocate, free, and be notified of an AFU interrupt. For opencapi, an AFU can trigger an interrupt on the host by sending a specific command targeting a 64-bit object handle. On POWER9, this is implemented by mapping a special page in the address space of a process and a write to that page will trigger an interrupt. Signed-off-by: Frederic Barrat Signed-off-by: Michael Ellerman --- drivers/misc/ocxl/afu_irq.c | 197 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 197 insertions(+) create mode 100644 drivers/misc/ocxl/afu_irq.c (limited to 'drivers/misc/ocxl/afu_irq.c') diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c new file mode 100644 index 000000000000..f40d853de401 --- /dev/null +++ b/drivers/misc/ocxl/afu_irq.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017 IBM Corp. +#include +#include +#include +#include "ocxl_internal.h" + +struct afu_irq { + int id; + int hw_irq; + unsigned int virq; + char *name; + u64 trigger_page; + struct eventfd_ctx *ev_ctx; +}; + +static int irq_offset_to_id(struct ocxl_context *ctx, u64 offset) +{ + return (offset - ctx->afu->irq_base_offset) >> PAGE_SHIFT; +} + +static u64 irq_id_to_offset(struct ocxl_context *ctx, int id) +{ + return ctx->afu->irq_base_offset + (id << PAGE_SHIFT); +} + +static irqreturn_t afu_irq_handler(int virq, void *data) +{ + struct afu_irq *irq = (struct afu_irq *) data; + + if (irq->ev_ctx) + eventfd_signal(irq->ev_ctx, 1); + return IRQ_HANDLED; +} + +static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq) +{ + int rc; + + irq->virq = irq_create_mapping(NULL, irq->hw_irq); + if (!irq->virq) { + pr_err("irq_create_mapping failed\n"); + return -ENOMEM; + } + pr_debug("hw_irq %d mapped to virq %u\n", irq->hw_irq, irq->virq); + + irq->name = kasprintf(GFP_KERNEL, "ocxl-afu-%u", irq->virq); + if (!irq->name) { + irq_dispose_mapping(irq->virq); + return -ENOMEM; + } + + rc = request_irq(irq->virq, afu_irq_handler, 0, irq->name, irq); + if (rc) { + kfree(irq->name); + irq->name = NULL; + irq_dispose_mapping(irq->virq); + pr_err("request_irq failed: %d\n", rc); + return rc; + } + return 0; +} + +static void release_afu_irq(struct afu_irq *irq) +{ + free_irq(irq->virq, irq); + irq_dispose_mapping(irq->virq); + kfree(irq->name); +} + +int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset) +{ + struct afu_irq *irq; + int rc; + + irq = kzalloc(sizeof(struct afu_irq), GFP_KERNEL); + if (!irq) + return -ENOMEM; + + /* + * We limit the number of afu irqs per context and per link to + * avoid a single process or user depleting the pool of IPIs + */ + + mutex_lock(&ctx->irq_lock); + + irq->id = idr_alloc(&ctx->irq_idr, irq, 0, MAX_IRQ_PER_CONTEXT, + GFP_KERNEL); + if (irq->id < 0) { + rc = -ENOSPC; + goto err_unlock; + } + + rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq, + &irq->trigger_page); + if (rc) + goto err_idr; + + rc = setup_afu_irq(ctx, irq); + if (rc) + goto err_alloc; + + *irq_offset = irq_id_to_offset(ctx, irq->id); + + mutex_unlock(&ctx->irq_lock); + return 0; + +err_alloc: + ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq); +err_idr: + idr_remove(&ctx->irq_idr, irq->id); +err_unlock: + mutex_unlock(&ctx->irq_lock); + kfree(irq); + return rc; +} + +static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx) +{ + if (ctx->mapping) + unmap_mapping_range(ctx->mapping, + irq_id_to_offset(ctx, irq->id), + 1 << PAGE_SHIFT, 1); + release_afu_irq(irq); + if (irq->ev_ctx) + eventfd_ctx_put(irq->ev_ctx); + ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq); + kfree(irq); +} + +int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset) +{ + struct afu_irq *irq; + int id = irq_offset_to_id(ctx, irq_offset); + + mutex_lock(&ctx->irq_lock); + + irq = idr_find(&ctx->irq_idr, id); + if (!irq) { + mutex_unlock(&ctx->irq_lock); + return -EINVAL; + } + idr_remove(&ctx->irq_idr, irq->id); + afu_irq_free(irq, ctx); + mutex_unlock(&ctx->irq_lock); + return 0; +} + +void ocxl_afu_irq_free_all(struct ocxl_context *ctx) +{ + struct afu_irq *irq; + int id; + + mutex_lock(&ctx->irq_lock); + idr_for_each_entry(&ctx->irq_idr, irq, id) + afu_irq_free(irq, ctx); + mutex_unlock(&ctx->irq_lock); +} + +int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd) +{ + struct afu_irq *irq; + struct eventfd_ctx *ev_ctx; + int rc = 0, id = irq_offset_to_id(ctx, irq_offset); + + mutex_lock(&ctx->irq_lock); + irq = idr_find(&ctx->irq_idr, id); + if (!irq) { + rc = -EINVAL; + goto unlock; + } + + ev_ctx = eventfd_ctx_fdget(eventfd); + if (IS_ERR(ev_ctx)) { + rc = -EINVAL; + goto unlock; + } + + irq->ev_ctx = ev_ctx; +unlock: + mutex_unlock(&ctx->irq_lock); + return rc; +} + +u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset) +{ + struct afu_irq *irq; + int id = irq_offset_to_id(ctx, irq_offset); + u64 addr = 0; + + mutex_lock(&ctx->irq_lock); + irq = idr_find(&ctx->irq_idr, id); + if (irq) + addr = irq->trigger_page; + mutex_unlock(&ctx->irq_lock); + return addr; +} -- cgit v1.2.3 From 92add22e84788d44e978662ca6bcd585f9ac081e Mon Sep 17 00:00:00 2001 From: Frederic Barrat Date: Tue, 23 Jan 2018 12:31:44 +0100 Subject: ocxl: Add trace points Define a few trace points so that we can use the standard tracing mechanism for debug and/or monitoring. Signed-off-by: Frederic Barrat Signed-off-by: Michael Ellerman --- drivers/misc/ocxl/afu_irq.c | 5 ++ drivers/misc/ocxl/context.c | 2 + drivers/misc/ocxl/link.c | 11 ++- drivers/misc/ocxl/trace.c | 6 ++ drivers/misc/ocxl/trace.h | 182 ++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 205 insertions(+), 1 deletion(-) create mode 100644 drivers/misc/ocxl/trace.c create mode 100644 drivers/misc/ocxl/trace.h (limited to 'drivers/misc/ocxl/afu_irq.c') diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c index f40d853de401..e70cfa24577f 100644 --- a/drivers/misc/ocxl/afu_irq.c +++ b/drivers/misc/ocxl/afu_irq.c @@ -4,6 +4,7 @@ #include #include #include "ocxl_internal.h" +#include "trace.h" struct afu_irq { int id; @@ -28,6 +29,7 @@ static irqreturn_t afu_irq_handler(int virq, void *data) { struct afu_irq *irq = (struct afu_irq *) data; + trace_ocxl_afu_irq_receive(virq); if (irq->ev_ctx) eventfd_signal(irq->ev_ctx, 1); return IRQ_HANDLED; @@ -102,6 +104,8 @@ int ocxl_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset) *irq_offset = irq_id_to_offset(ctx, irq->id); + trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq, + *irq_offset); mutex_unlock(&ctx->irq_lock); return 0; @@ -117,6 +121,7 @@ err_unlock: static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx) { + trace_ocxl_afu_irq_free(ctx->pasid, irq->id); if (ctx->mapping) unmap_mapping_range(ctx->mapping, irq_id_to_offset(ctx, irq->id), diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c index 269149490063..909e8807824a 100644 --- a/drivers/misc/ocxl/context.c +++ b/drivers/misc/ocxl/context.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0+ // Copyright 2017 IBM Corp. #include +#include "trace.h" #include "ocxl_internal.h" struct ocxl_context *ocxl_context_alloc(void) @@ -214,6 +215,7 @@ int ocxl_context_detach(struct ocxl_context *ctx) mutex_lock(&ctx->afu->afu_control_lock); rc = ocxl_config_terminate_pasid(dev, afu_control_pos, ctx->pasid); mutex_unlock(&ctx->afu->afu_control_lock); + trace_ocxl_terminate_pasid(ctx->pasid, rc); if (rc) { /* * If we timeout waiting for the AFU to terminate the diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c index fbca3feec592..f30790582dc0 100644 --- a/drivers/misc/ocxl/link.c +++ b/drivers/misc/ocxl/link.c @@ -7,6 +7,7 @@ #include #include #include "ocxl_internal.h" +#include "trace.h" #define SPA_PASID_BITS 15 @@ -116,8 +117,11 @@ static void ack_irq(struct spa *spa, enum xsl_response r) else WARN(1, "Invalid irq response %d\n", r); - if (reg) + if (reg) { + trace_ocxl_fault_ack(spa->spa_mem, spa->xsl_fault.pe, + spa->xsl_fault.dsisr, spa->xsl_fault.dar, reg); out_be64(spa->reg_tfc, reg); + } } static void xsl_fault_handler_bh(struct work_struct *fault_work) @@ -182,6 +186,7 @@ static irqreturn_t xsl_fault_handler(int irq, void *data) int lpid, pid, tid; read_irq(spa, &dsisr, &dar, &pe_handle); + trace_ocxl_fault(spa->spa_mem, pe_handle, dsisr, dar, -1); WARN_ON(pe_handle > SPA_PE_MASK); pe = spa->spa_mem + pe_handle; @@ -532,6 +537,7 @@ int ocxl_link_add_pe(void *link_handle, int pasid, u32 pidr, u32 tidr, * the problem. */ mmgrab(mm); + trace_ocxl_context_add(current->pid, spa->spa_mem, pasid, pidr, tidr); unlock: mutex_unlock(&spa->spa_lock); return rc; @@ -577,6 +583,9 @@ int ocxl_link_remove_pe(void *link_handle, int pasid) goto unlock; } + trace_ocxl_context_remove(current->pid, spa->spa_mem, pasid, + be32_to_cpu(pe->pid), be32_to_cpu(pe->tid)); + memset(pe, 0, sizeof(struct ocxl_process_element)); /* * The barrier makes sure the PE is removed from the SPA diff --git a/drivers/misc/ocxl/trace.c b/drivers/misc/ocxl/trace.c new file mode 100644 index 000000000000..1e6947049697 --- /dev/null +++ b/drivers/misc/ocxl/trace.c @@ -0,0 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017 IBM Corp. +#ifndef __CHECKER__ +#define CREATE_TRACE_POINTS +#include "trace.h" +#endif diff --git a/drivers/misc/ocxl/trace.h b/drivers/misc/ocxl/trace.h new file mode 100644 index 000000000000..bcb7ff330c1e --- /dev/null +++ b/drivers/misc/ocxl/trace.h @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017 IBM Corp. +#undef TRACE_SYSTEM +#define TRACE_SYSTEM ocxl + +#if !defined(_TRACE_OCXL_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_OCXL_H + +#include + +DECLARE_EVENT_CLASS(ocxl_context, + TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr), + TP_ARGS(pid, spa, pasid, pidr, tidr), + + TP_STRUCT__entry( + __field(pid_t, pid) + __field(void*, spa) + __field(int, pasid) + __field(u32, pidr) + __field(u32, tidr) + ), + + TP_fast_assign( + __entry->pid = pid; + __entry->spa = spa; + __entry->pasid = pasid; + __entry->pidr = pidr; + __entry->tidr = tidr; + ), + + TP_printk("linux pid=%d spa=0x%p pasid=0x%x pidr=0x%x tidr=0x%x", + __entry->pid, + __entry->spa, + __entry->pasid, + __entry->pidr, + __entry->tidr + ) +); + +DEFINE_EVENT(ocxl_context, ocxl_context_add, + TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr), + TP_ARGS(pid, spa, pasid, pidr, tidr) +); + +DEFINE_EVENT(ocxl_context, ocxl_context_remove, + TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr), + TP_ARGS(pid, spa, pasid, pidr, tidr) +); + +TRACE_EVENT(ocxl_terminate_pasid, + TP_PROTO(int pasid, int rc), + TP_ARGS(pasid, rc), + + TP_STRUCT__entry( + __field(int, pasid) + __field(int, rc) + ), + + TP_fast_assign( + __entry->pasid = pasid; + __entry->rc = rc; + ), + + TP_printk("pasid=0x%x rc=%d", + __entry->pasid, + __entry->rc + ) +); + +DECLARE_EVENT_CLASS(ocxl_fault_handler, + TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc), + TP_ARGS(spa, pe, dsisr, dar, tfc), + + TP_STRUCT__entry( + __field(void *, spa) + __field(u64, pe) + __field(u64, dsisr) + __field(u64, dar) + __field(u64, tfc) + ), + + TP_fast_assign( + __entry->spa = spa; + __entry->pe = pe; + __entry->dsisr = dsisr; + __entry->dar = dar; + __entry->tfc = tfc; + ), + + TP_printk("spa=%p pe=0x%llx dsisr=0x%llx dar=0x%llx tfc=0x%llx", + __entry->spa, + __entry->pe, + __entry->dsisr, + __entry->dar, + __entry->tfc + ) +); + +DEFINE_EVENT(ocxl_fault_handler, ocxl_fault, + TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc), + TP_ARGS(spa, pe, dsisr, dar, tfc) +); + +DEFINE_EVENT(ocxl_fault_handler, ocxl_fault_ack, + TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc), + TP_ARGS(spa, pe, dsisr, dar, tfc) +); + +TRACE_EVENT(ocxl_afu_irq_alloc, + TP_PROTO(int pasid, int irq_id, unsigned int virq, int hw_irq, + u64 irq_offset), + TP_ARGS(pasid, irq_id, virq, hw_irq, irq_offset), + + TP_STRUCT__entry( + __field(int, pasid) + __field(int, irq_id) + __field(unsigned int, virq) + __field(int, hw_irq) + __field(u64, irq_offset) + ), + + TP_fast_assign( + __entry->pasid = pasid; + __entry->irq_id = irq_id; + __entry->virq = virq; + __entry->hw_irq = hw_irq; + __entry->irq_offset = irq_offset; + ), + + TP_printk("pasid=0x%x irq_id=%d virq=%u hw_irq=%d irq_offset=0x%llx", + __entry->pasid, + __entry->irq_id, + __entry->virq, + __entry->hw_irq, + __entry->irq_offset + ) +); + +TRACE_EVENT(ocxl_afu_irq_free, + TP_PROTO(int pasid, int irq_id), + TP_ARGS(pasid, irq_id), + + TP_STRUCT__entry( + __field(int, pasid) + __field(int, irq_id) + ), + + TP_fast_assign( + __entry->pasid = pasid; + __entry->irq_id = irq_id; + ), + + TP_printk("pasid=0x%x irq_id=%d", + __entry->pasid, + __entry->irq_id + ) +); + +TRACE_EVENT(ocxl_afu_irq_receive, + TP_PROTO(int virq), + TP_ARGS(virq), + + TP_STRUCT__entry( + __field(int, virq) + ), + + TP_fast_assign( + __entry->virq = virq; + ), + + TP_printk("virq=%d", + __entry->virq + ) +); + +#endif /* _TRACE_OCXL_H */ + +/* This part must be outside protection */ +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#define TRACE_INCLUDE_FILE trace +#include -- cgit v1.2.3